S-96877A222 4-40 x 5/8" FF-S-92, QQ-P-35, MS51959-18, SAE AMS2700 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments.
• High tensile strength of 70,000 psi ensures reliable fastening under demanding mechanical loads.
• Flush mounting capability with an 82° countersink angle and standard flat head profile for smooth surface finishes.
• Easy installation and removal using a No. 1 Phillips drive, reducing assembly time and tool wear.
• Consistent thread engagement with UNC coarse threads and Class 2A fit for quick, secure fastening in various materials.
• Full threading along the 5/8" length provides maximum grip and uniform stress distribution.
• Compliance with multiple industry standards guarantees quality and reliability for critical applications.

Professional Applications & Engineering Value

This 4-40 UNC flat head screw is engineered to address common industrial challenges such as vibration loosening and corrosion-induced failure. Made from passivated 18-8 stainless steel, it offers excellent resistance to rust and chemicals, making it suitable for electronics, machinery, and automotive assemblies where durability is paramount. The Phillips drive ensures straightforward installation with standard tools, while the coarse thread spacing and fully threaded design enhance holding power in soft or brittle materials. Its 82° countersink angle allows for a seamless fit, reducing protrusion risks and improving aesthetic integration in precision equipment.

Specification Summary & Compliance

This screw adheres to precise dimensional tolerances, including Class 2A thread fit and UNC thread standards, ensuring compatibility and performance. It meets specifications such as Fed. Spec. FF-S-92, QQ-P-35, MS51959-18, and SAE AMS2700, and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and sustainable use in global markets.